Nutsinee, Sheila

Wensday afternoon Nutsinee and I went into HAM6 to tie up a few loose ends in HAM6 while we still had the interferometer beam available. 

We had originally placed the beam dump to catch the IFO beam in reflection off of the beam diverter back side close to the diverter because we couldn't see the beam and were trying to dead reckon the position of the dump.  With 3 Watts into the interferometer we were able to see the beam reflecting off the black glass, so Nutsinee and I slid it a few inches away.  Attached photos show 1) where the interferometer beam hits the black glass side of the diverter (with the dump in its original close placement) 2) the final location of the diverter and dump 3) the beam hitting the beam dump is just barely visible in the lower right corner of the  IR card.

We also checked the clearances of the single bounce beams on the other side of HAM6, which was just a double check of what Thomas logged here, and is pretty much in agreement with those measurements within the precision of the measurement technique.  

Beam entering from HAM5 clears OM2 cage by 35mm, clears fast shutter wire without a problem, clears fast shutter structure by ~10mm.  The beam from OM1 towards OM2 clears the AS_C lens by about 14mm, the edge of the OM3 cage by ~15 mm, and when the shutter is closed it is directed into the pipe beam dump.  The beam from OM2 towards OM3 clears the OMC shroud by about 17 mm.